The therafirm compression stockings with 20-30 mmhg are designed to prevent moderate swelling for men or women.  the compression stockings are semi opaque knit and the soft comfort band is non-restrictive while staying in place for all day wear. true gradient compression delivers a controlled amount of pressure greatest at the ankle and gradually decreases towards the top of the stocking to promote better blood flow. this style of this compression stocking is thigh high. be sure to use the size chart and measuring instructions to determine best size and fit. size ankle calf thigh length small 15.9cm - 18.4cm 26.7cm - 33cm 38.1cm - 45.7cm 58.4cm - 66cm medium 19.1cm - 22.2cm 29.2cm - 35.6cm 44.5cm - 52.1cm 58.4cm - 73.7cm large 22.2cm - 25.4cm 31.8cm - 38.1cm 50.8cm - 58.4cm 63.5cm - 78.7cm x-large 25.4cm - 28.57cm 34.3cm - 40.6cm 57.1cm - 64.8cm 68.6cm - 83.8cm xx-large 28.57cm - 31.8cm 36.8cm - 43.2cm 63.5cm - 71.1cm 73.7cm - 88.9cm "